#!bin/bash
echo -n "Nhap chuoi:"; read s
echo "Xuat chuoi:$s"


echo `expr index "$s" 't'`

#if [ `expr index "$s" ' '` -ne 0 ]
#then
#	echo  "Co khoang trang"
#else
#	echo  "Khong co khoang trang"
#fi
